Gutter Margin: Margin on the “inside” of a printed book page. When books are printed, the margin on the inside is usually larger to allow for easy book handling. We assure your gutter margin when making plates for printing, free of charge.From: ANSI/NISO/LBI STANDARD FOR LIBRARY BINDING – (inner margin, gutter margin, back margin) The distance between the binding edge of a printed page and the printed area.

Halftone (pre-press): An image taken from your photo that has a dot pattern laid on it (or made up of dots) for better reproduction. Without the correct dot pattern, the photo would look like a bad copy machine copy (motley). Many of today’s newer copiers automatically lay a pattern, thus better copies.

Note most QR codes will work if damaged even 30% – allowing for some “high traffic” uses such as name tags, postcards, coasters, etc.

Don’t saturate your viewer with too many codes – make them useful and enjoyable.

Try to keep codes away from glossy surfaces – matte makes scanning easier for the novice and under more lighting conditions. Still want to put one on your book cover? You could skip lamination or UV protection, but applying a dust jacket, belly band, or sticker over the finished cover would be better for the longevity of the book.

If using multiple codes, don’t place them too close together – you are trying to make it easy for the user. If on a mail piece with smbc – allow for distance as well.